![]() ![]() I need some sort of controller (raspberry pi/otherwise) - I’d guess this is a common enough application that I don’t need to actually code my own setup and can buy this prefab? I’ve done DIY coding with particle photos and built my own iOS and web apps, so I can if needed, but feel like that could be avoided?.I need some sort of button/dial setup for controlling it (guessing those can be had pre-fab without having to buy the individual elements?).Worm gear stepper motor - I’m struggling to find a site / way to search for something with the right combination of RPMs and torque - suggestions on motors or places to look?.Or if I go with an 8 tooth gear on the motor, I’d get 4rpm at the 30t gear with 15rpm at the motor. I’d say target 30 seconds or less to raise/lower = so 3-4 RPM.More/less if I got a different gear to attach to the motor. Need to lower 2.7m of fabric (106 inches) - so 6.75 rotations if I got a matching gear for the other side of the chain. call it 2.5” radius on average, 15.7 inch circumference.But I'm trying to figure out the right size / power setup.I want it to hold position without requiring power (so worm gear, right?) I’m happy to hold button as it goes, I don’t need it to ‘know’ when to stop/start. I want to be able to control speed and direction and start/stop as needed. (am I going to have a connection issues with grub screws? do I need to key the shaft?) I’m planning to us a chain around the current sprocket and run down to a tooth sprocket that I can mount to the shaft of a worm gear stepper motor with grub screws to the shaft. And the radius (let’s assume 3” - 1” for the pipe and then 2” more for the fabric wound around it). So 58N, if I’m thinking about it the right way. So when fully extended, the first rotations need to lift ~6kg of weight. I'll be raising and lowering a screen made of approx 750g/m2 fabric from the pipe down 2.7m to the ground. On the end of the tube, I have a sprocket mounted (30 Tooth 08B Simplex Taper Sprocket to suit 1/2 Inch Pitch Chain) I've got the screen mounted on a 2" diameter mild steel tube sitting in pillow block bearings - so it rotates freely. Hi there, I'm building an indoor golf simulator, and as part of that, I have an impact screen (think large projector screen) that I need to raise / lower. ![]()
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